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Paper detail

Fano Resonances in the Infrared Spectra of Phonons in Hyper-Kagome Na_3Ir_3O_8

We report the complex dielectric function of high-quality Na_3Ir_3O_8 single crystals determined by spectroscopic ellipsometry in the spectral range from 15 meV to 2 eV. The far-infrared phonon spectra exhibit highly asymmetric line shapes characteristic of Fano resonances. With decreasing temperature, we observe a sharp increase of the infrared intensity of the Fano-shaped phonon modes accompanied by concomitant changes in the low energy electronic background, formed by electronic transitions between Ir 5d t_2g bands of a mostly J_eff = 1/2 character. The role of the complex Hyper-Kagome lattice structure and strong spin-orbit coupling is considered.

preprint2013arXivOpen access
D. PröpperA. N. YareskoT. I. LarkinT. N. StanislavchukA. A. SirenkoT. TakayamaA. MatsumotoH. TakagiB. KeimerA. V. Boris
cond-mat.str-elcond-mat.mtrl-sci
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D. PröpperA. N. YareskoT. I. LarkinT. N. StanislavchukA. A. SirenkoT. TakayamaA. MatsumotoH. TakagiB. KeimerA. V. Boris

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